pip is configured with locations that require TLS/SSL,
however the ssl module in Python is not available.
Could not fetch URL https://pypi.org/simple/pip/:
There was a problem confirming the ssl certificate:
HTTPSConnectionPool(host=‘pypi.org‘, port=443): Max retries exceeded with
url: /simple/pip/
(Caused by SSLError("Can‘t connect to HTTPS URL because the SSL module is not available.")) - skipping
在~/.pip/pip.conf文件中添加或修改
在root目录下新建.pip目录，
cd root
mkdir .pip
cd .pip
touch pip.conf
vi pip.conf
[global]
index-url = http://mirrors.aliyun.com/pypi/simple/ #可以手工指定是http的或者https的
[install]
trusted-host=mirrors.aliyun.com
pip3 install requests
Looking in indexes: http://mirrors.aliyun.com/pypi/simple/
Collecting requests
Downloading http://mirrors.aliyun.com/pypi/packages/7d/e3/20f3d364d6c8e5d2353c72a67778eb189176f08e873c9900e10c0287b84b/requests-2.21.0-py2.py3-none-any.whl (57kB)
100% |████████████████████████████████| 61kB 695kB/s
Collecting urllib3<1.25,>=1.21.1 (from requests)
Downloading http://mirrors.aliyun.com/pypi/packages/62/00/ee1d7de624db8ba7090d1226aebefab96a2c71cd5cfa7629d6ad3f61b79e/urllib3-1.24.1-py2.py3-none-any.whl (118kB)
100% |████████████████████████████████| 122kB 1.3MB/s
Collecting idna<2.9,>=2.5 (from requests)
Downloading http://mirrors.aliyun.com/pypi/packages/14/2c/cd551d81dbe15200be1cf41cd03869a46fe7226e7450af7a6545bfc474c9/idna-2.8-py2.py3-none-any.whl (58kB)
100% |████████████████████████████████| 61kB 1.7MB/s
Collecting certifi>=2017.4.17 (from requests)
Downloading http://mirrors.aliyun.com/pypi/packages/9f/e0/accfc1b56b57e9750eba272e24c4dddeac86852c2bebd1236674d7887e8a/certifi-2018.11.29-py2.py3-none-any.whl (154kB)
100% |████████████████████████████████| 163kB 2.3MB/s
Collecting chardet<3.1.0,>=3.0.2 (from requests)
Downloading http://mirrors.aliyun.com/pypi/packages/bc/a9/01ffebfb562e4274b6487b4bb1ddec7ca55ec7510b22e4c51f14098443b8/chardet-3.0.4-py2.py3-none-any.whl (133kB)
100% |████████████████████████████████| 143kB 1.3MB/s
Installing collected packages: urllib3, idna, certifi, chardet, requests
Successfully installed certifi-2018.11.29 chardet-3.0.4 idna-2.8 requests-2.21.0 urllib3-1.24.1
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原文地址：https://www.cnblogs.com/SunshineKimi/p/10540371.html